JP5540336B2 - Earthquake motion generator - Google Patents

Description

  The present invention relates to a seismic motion generating device, and more particularly to a seismic power generating device capable of reproducing artificial vibrations in a moving body levitated from a floor surface to reproduce the shaking of the ground or floor surface due to the earthquake.

  Conventionally, as this type of seismic experience device, a shaker type device has been generally adopted. In this exciter type device, a model room can be built and vibrated, but the reproducible vibration is only short-period vibration. Therefore, for example, long-period ground motion excited when a huge earthquake that occurred in a remote area propagated to the Kanto plain, or rolls with an amplitude of m that can occur on the upper floors of high-rise buildings due to the long-period ground motion. There was a drawback that it could not be reproduced. Furthermore, in such a shaker type, since the means for generating the seismic motion is mainly composed of a hydraulic cylinder, it is not possible to avoid an increase in the size of the device, and it is not excellent in terms of transportation and installation. There was a problem.

  Thus, for example, Patent Document 1 discloses a self-propelled vibration device that can be downsized and can be easily transported and installed. In the vibration device disclosed in Patent Document 1, a wheel mechanism such as an omni foil attached to the back side of the floor board is driven by a motor and travels on the installation surface to generate vibration on the floor board.

JP 2008-116567 A

  In general, the pressure-receiving part of the drive module for traveling is between a passive part that rotates freely while receiving only a load when traveling in a predetermined direction, and an installation surface by rotating by being connected to a power transmission mechanism. In the vibration device disclosed in Patent Document 1, the wheel mechanism that is the active component is the only contact portion with the floor surface. That is, the wheel mechanism of the vibration device has a structure in which a driving force is generated in a state where a load of a vibration target mounted on the floor board is received. However, since the ratio of the ground contact area of the wheel mechanism to the device area is very small, the load concentrates on the wheel mechanism and the contact pressure with the floor surface increases, and the floor surface There was a risk of damage. As a result, this conventional vibration device has a problem that the allowable weight of the object to be vibrated has to be relatively small with respect to the overall size of the device.

  Moreover, the wheel mechanism of this conventional vibration device is adapted to generate a propulsive force by friction with the floor surface, but the omni foil or the like used as a part of this wheel mechanism has a small pressure receiving area. . Therefore, in the vibration device in which such a component is applied as a wheel mechanism, the propulsive force generated in the plane direction is limited in order to avoid slippage between the wheel mechanism component and the floor surface and damage to the floor surface. There has been a problem that high-speed or high-speed vibrations cannot be generated.

  Furthermore, in Patent Document 1, an example is disclosed in which a plurality of vibration device units are connected to adjust the area of the entire floor plate to adapt to the size of the vibration target to be mounted. The part that functions as the unit connection mechanism does not contribute to receiving the load of the mounted vibration target or generating a thrust in the plane direction. This was one factor that further reduced the ratio.

  On the other hand, other self-propelled vibration devices include a device in which a vibration table is driven by a ball screw or a hydraulic cylinder, or a wheel including three or more special omnidirectional crawlers disposed on the back side of the vibration table. There are devices that run on the installation surface through a mechanism.

  However, when this type of self-propelled vibration device is used to increase the size of the vibration table, the drive mechanism becomes large-scale, and the structure does not include the drive mechanism as a proportion of the mass to be driven. There was no problem. For this reason, when trying to make this drive system strong, a dilemma that the mass to be driven increases more and more, which is extremely difficult to realize.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to easily reduce the weight of the apparatus by generating artificial vibrations in a moving body levitated from the floor surface. It is another object of the present invention to provide a seismic motion generator capable of reproducing desired seismic motion.

  The object of the present invention is to provide a moving body that is arranged on a flat floor surface and is levitated from the floor surface by ejecting compressed air from the bottom surface toward the floor surface, and a plurality of different locations of the moving body. A plurality of wire members each having one end fixed thereto, a plurality of traction means arranged around the floor surface to respectively pull the other ends of the plurality of wire members, and each of the plurality of traction means Drive control means for controlling drive, and the drive control means cooperatively controls the traction operation of the plurality of traction means to generate a desired earthquake motion on the moving body. This is achieved by a seismic motion generator.

  Moreover, the said objective of this invention is effectively achieved by providing the several air unit for levitation which ejects the said compressed air in the bottom face of the said mobile body.

  Moreover, the said objective of this invention is achieved effectively by each of the said several air unit for levitation | jetting ejecting the said compressed air each independently.

Further, the object of the present invention is to detect each tensile force of the plurality of wire members and output the detected information to the drive control means, and on the floor surface of the movable body. A position detection unit that detects a two-dimensional position and outputs the detected information to the drive control unit, and the drive control unit is based on detection information from the tensile force detection unit and the position detection unit. Thus, it is effectively achieved by controlling the driving of each of the plurality of traction means.

  In addition, the above object of the present invention is effectively achieved by at least one of the plurality of wire members having a spring element in a part thereof.

  Furthermore, the object of the present invention is to provide a pair of wire members stretched at opposing positions among the plurality of wire members, each other end being pulled by the pulling means, and the other end being a rotating member. This is achieved effectively by being interconnected via the.

  The seismic motion generator according to the present invention is configured such that a moving body suspended on a flat floor surface can be pulled and moved in other directions via a plurality of wire members. Thereby, since the friction characteristic when moving the moving body in the horizontal direction can be reduced, vibration can be generated with less driving energy, and the moving body is driven without using wheels, etc. Generation of noise and vertical vibrations can be suppressed.

  Moreover, in the seismic-motion generator of this invention, it is the structure which isolate | separated the mass of the moving body and the mass of the drive system for generating a vibration to this moving body. Therefore, even if the drive system is strengthened, the mass of the moving object that is the drive target does not increase, so that the reproducible range of seismic motion can be expanded.

  Further, in the seismic motion generating apparatus according to the present invention, even if the area of the moving body is increased, the traction force required for the increase is almost the same, so that the allowable load that can be placed on the moving body is increased. Can be easily achieved. As a result, for example, the room itself installed on the moving body can be set as a target for generating earthquake motion.

(A) is a top view of the seismic-motion generator which concerns on 1st Embodiment of this invention, (B) is a cross-sectional arrow view along the II line in (A). (A) is a side view which shows schematic structure of the floating body of a seismic-motion generator, (B) is the bottom view. (A) is a top view of the earthquake motion generator according to the second embodiment of the present invention, and (B) is a sectional view taken along line III-III in (A). (A) is a top view of the earthquake motion generator according to the third embodiment of the present invention, and (B) is a sectional view taken along line IV-IV in (A).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1A is a top view of the ground motion generator according to the first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line I-I in FIG. . FIG. 2A is a side view showing a schematic configuration of the floating body of the seismic motion generator, and FIG. 2B is a bottom view thereof.

  The seismic motion generating apparatus 1 according to the first embodiment of the present invention is a square flat surface 2 surrounded on all four sides by side walls 2a, and is arranged on the floor 2 so as to face the floor 2 from the bottom. Four wire members each having a square-shaped moving body 3 configured to be able to rise from the floor surface 2 with a predetermined gap height by blowing compressed air, and having one end fixed to each of the four corners of the moving body 3 4, four traction portions 5 that are arranged outside the four corners of the square floor surface 2 and have motors 5 a that pull the other ends of the four wire members 4, and each of the four traction portions 5. And a drive control unit 6 that controls driving.

  As shown in FIG. 1 (B), the other end of each wire member 4 is fixed to a reel 5b connected to an output shaft of a motor 5a of each traction section 5 via rollers 2b arranged at four corners of the side wall 2a. The drive control unit 6 cooperatively controls the traction operation of the motors 5 a of the four traction units 5, thereby generating a desired earthquake motion on the moving body 3. Although not shown, each pulling unit 5 is provided with a tensile force detection unit that detects the tensile force of each wire member and outputs the detected tensile force information to the drive control unit 6, and Around the floor surface 2, a position detection unit that detects a two-dimensional position of the moving body 3 on the floor surface 2 and outputs the position information to the drive control unit 6 is provided. Then, the drive control unit 6 drives each traction unit 5 based on the tensile force information of each wire member 4 output from the tensile force detection unit and the position information of the moving body 4 output from the position detection unit. It controls individually and implement | achieves the cooperative traction operation | movement by each traction part 5. FIG.

  As shown in FIG. 2, four floating air units 7 that eject compressed air toward the floor surface 2 are provided on the bottom surface of the moving body 3 at the center of each of the four divided areas. By the arrangement of the plurality of floating air units 7, the inclination of the moving body 3 is suppressed. The levitation air unit 7 ejects compressed air from the center of a circular portion covered with a material from a cellular sponge or the like, and each circular portion supplies compressed air via a flexible pipe 8. Connected to the pump 9.

  When the levitation air unit 7 is operated, the moving body 3 may be lifted from the floor 2 and at the same time, the moving body 3 is likely to be peeled upward. In such a case, a force resisting this peeling is generated by Bernoulli's theorem. Accordingly, when moving the moving body 3 on which an object (such as a person) having a predetermined weight is moved in the horizontal direction, the lifting force due to the compressed air ejected from the floating air unit 7 toward the floor surface 2 The moving body 3 is supported by both the attractive force generated by the compressed air flowing at high speed through the narrow gap S between the floor surface 2 and the bottom surface of the moving body 3. As a result, stable floating support is realized in which the moving body 3 maintains a state of being lifted from the floor surface 2 at a certain height.

  In FIG. 2, the compressed air is sent to four floating air units 7 by one pump 9, but each pump 9 is connected to one floating air unit 7, By independently controlling the flying operation of the floating air unit 7, the moving body 3 may be kept more horizontal.

  According to the seismic motion generating apparatus 1 according to the present embodiment configured as described above, the moving body 3 is floated on the floor 2 and the wire members 4 fixed to the four corners of the moving body 3 are connected to the respective traction portions. By pulling cooperatively by 5, it is possible to easily generate a desired vibration motion with respect to the moving body 3.

  Moreover, in this earthquake motion generating apparatus 1, even if the area of the moving body 3 is increased, the traction force required with the increase is almost the same, so the motor 5a of the traction unit 5 is not enlarged. The allowable load that can be placed on the movable body 3 can be easily increased.

  FIG. 3A is a top view of the seismic motion generator according to the second embodiment of the present invention, and FIG. 3B is a cross-sectional view taken along line III-III in FIG. . In the figure, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted here.

  As shown in the figure, in the seismic motion generating apparatus 1A according to the second embodiment of the present invention, a pair of wires stretched at opposing positions among the wire members whose one ends are fixed to the four corners of the moving body 3. The other ends of the member 4Ax and the wire member 4Ay are pulled by a driving pulley 5Ac that rotates as the motor 5Aa of the pulling portions 5A (2), 5A (4) and the pulling portions 5A (1), 5A (3) is driven. At the same time, the other ends are interconnected via free rotation pulleys (free rotation members) 5Ad disposed in the pulling portions 5A (1) to (4). That is, one wire member 4Ax includes the lower left roller 2b of the floor 2 from the lower left corner of the moving body 3, the drive pulley 5Ac of the traction unit 5A (4), the free rotation pulley 5Ad of the traction unit 5A (1), and the traction unit. It is connected to the upper right corner of the moving body 3 via a drive pulley 5Ac of 5A (2) and a roller 2b on the upper right side of the floor surface 2. On the other hand, the other wire member 4Ay includes the upper left roller 2b of the floor 2 from the upper left corner of the moving body 3, the drive pulley 5Ac of the traction portion 5A (1), the free rotation pulley 5Ad of the traction portion 5A (2), and traction. It is connected to the lower right corner of the moving body 3 via the drive pulley 5Ac of the part 5A (3) and the lower right roller 2b of the floor 2.

  In addition, the wire members 4Ax and 4Ay have spring elements 10Ax and 10Ay interposed therebetween. The spring elements 10Ax and 10Ay give a force to the center portion by the elastic force, and the length adjustment of the wire members 4Ax and 4Ay by moving the moving body 3 from the center on the floor surface 2 which is the initial position. I do. Accordingly, the spring elements 10Ax and 10Ay are always extended to some extent, and a predetermined tensile force is applied to the wire members 4Ax and 4Ay.

  According to the seismic motion generating apparatus 1A according to the present embodiment configured as described above, the wire member fixed to the diagonal of the moving body 3 can be used as well as exhibiting the same effects as the first embodiment described above. Since the movable body 3 is moved by connecting the two wire members 4Ax and 4Ay, the traction operation by each of the traction units 5A can be controlled more cooperatively. The range of seismic motion can be expanded.

  FIG. 4 (A) is a top view of a ground motion generator according to the third embodiment of the present invention, and FIG. 4 (B) is a sectional view taken along line III-III in FIG. 4 (A). . In the figure, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted here.

  As shown in the figure, in the seismic motion generating device 1B according to the third embodiment of the present invention, a pair of wires stretched at opposing positions among the wire members whose one ends are fixed to the four corners of the moving body 3. The other ends of the member 4Bx and the wire member 4By are pulled by a driving pulley 5Be that rotates with the driving of the motor 5Ba of the pulling portions 5B (1), 5B (3) and the pulling portions 5B (2), 5B (4). In addition, the other ends are stilted by a plurality of support columns 2Bc via free rotation pulleys (free rotation members) 5Bf and 5Bg disposed in the respective traction portions 5B (1) to (4). Interconnected below the floor surface 2B. That is, one wire member 4Bx passes from the upper left corner of the moving body 3 through the upper left roller 2Bb on the floor 2B, the upper free rotating pulley 5Bf of the pulling portion 5A (1), the driving pulley 5Be, and the lower free rotating pulley 5Bg. After that, the lower free rotation pulley 5Bg, the drive pulley 5Be, the upper free rotation pulley 5Bf, and the lower right roller 2Bb of the floor 2B are connected to the lower right corner of the moving body 3 through the pulling portion 5A (3). On the other hand, the other wire member 4By includes the upper right roller 2Bb on the floor 2B from the upper right corner of the moving body 3, the upper free rotating pulley 5Bf of the pulling portion 5A (2), the driving pulley 5Be, and the lower free rotating pulley 5Bg. After passing, the lower free rotation pulley 5Bg of the pulling portion 5A (4), the drive pulley 5Be, the upper free rotation pulley 5Bf, and the lower left roller 2Bb of the floor surface 2B are connected to the lower left corner of the moving body 3.

  Further, the spring members 10Bx and 10By are interposed in the middle of the wire members 4Bx and 4By. The action of the spring elements 10Bx and 10By is the same as that of the second embodiment described above, and applies a predetermined tensile force to the wire members 4Bx and 4By.

  According to the seismic motion generator 2A according to the present embodiment configured as described above, the same effect as the first embodiment and the second embodiment described above can be obtained, and the movable body 3 can be fixed to the diagonal. Since the two wire members 4Bx and 4By connecting the formed wire members are passed below the floor surface 2B, the length of the wire members 4Bx and 4By is made shorter than that of the second embodiment. And a decrease in tensile force can be suppressed. As a result, the range of possible seismic motion can be further expanded.

  As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to this, In the range which does not deviate from the meaning, it can change suitably.

1, 1A, 1B ... earthquake experience device 2, 2B ... floor surface 3 ... moving body 4, 4Ax, 4Ay, 4Bx, 4By ... wire members 5, 5A, 5B ... towing part 5Ad , 5Bf, 5Bg... Freely rotating pulley 6... Drive control unit 7... Levitating air unit 10Ax, 10Ay, 10Bx, 10By.

Claims (6)

A moving body which is arranged on a flat floor surface and is levitated from the floor surface by blowing out compressed air from the bottom toward the floor surface;
A plurality of wire members each having one end fixed to a plurality of different locations of the moving body;
A plurality of traction means disposed around the floor surface to respectively pull the other ends of the plurality of wire members;
Drive control means for controlling the drive of each of the plurality of traction means,
A seismic motion generating apparatus characterized in that a desired seismic motion is generated in the movable body by the drive control means cooperatively controlling the pulling operation of the plurality of pulling means.   The seismic-motion generator of Claim 1 with which the several air unit for levitation which ejects the said compressed air is provided in the bottom face of the said mobile body.   The seismic motion generator according to claim 2, wherein each of the plurality of floating air units ejects the compressed air independently. A tensile force detector that detects each tensile force of the plurality of wire members and outputs the detected information to the drive control means;
A position detection unit that detects a two-dimensional position of the movable body on the floor surface and outputs the detected information to the drive control unit;
4. The earthquake motion generating device according to claim 1, wherein the drive control unit controls driving of each of the plurality of traction units based on detection information from the tensile force detection unit and the position detection unit. .   The earthquake motion generating device according to any one of claims 1 to 4, wherein at least one of the plurality of wire members has a spring element in a part thereof.   The pair of wire members stretched at opposing positions among the plurality of wire members are each pulled at the other end by the pulling means, and the other ends are interconnected via a rotating member. Item 6. The ground motion generator according to any one of Items 1 to 5.

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